needs a decomposition first. first, render out the fats, should be plenty, then debone it, dehydrate and turn the flesh into charcoal, then the bones become fertiliser. oh, and don't forget the blood. essential to string them upside down and drain all of the blood as this is also fertiliser, so it is better as fertiliser than dirtying the furnace.

anyway, just jokes. better to let nature do that, best way is we just leave them all together to ponder their fate and they can do the burning and all that butchery.